Any recommendations for large cushions to make Hemnes daybed a comfortable sofa?

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I've just acquired an Ikea Hemnes daybed for the spare room. The vast majority of the time it will be used as a sofa in the spare room where I'm intending to put our (only) TV as well as it making the room where DD's toys live (her bedroom is tiny).

Having assembled the daybed I see its very deep and will need some firm deep cushions along the back to make a comfortable sofa.

Any recommendations gratefully received?

Resurrecting this just in case anyone has any thoughts?

I haven't really found a good solution and have just bought a few smaller cushions.

I don't like the lip at the top as it's really easy to clonk yourself on it if you're not careful. I wish IKEA sold a bolster type cushion to go along the back.

Thanks for getting back to me! I've gone for a single bed with trundle and will be getting one of these littlejax.co.uk/products/luxury-chic-wedge-pillow